Thanks for the advice guys, I removed teh carby again and used a metal rule to check if any of the surfaces are warped? (Is that how it's checked?) It seems ok.
I pulled out the diaphram again and had a look at that seems ok, how do I check how much play the butterfly valve should have?

Also adjusted the choke, took the air filter off to check. The choke might open to much now,as there's no longer a small slit when the choke is open. What's the ideal setting?

Thx